EN ISO 10642:2026

SLOVENSKI STANDARD
01-maj-2026
Vezni elementi - Vijaki z ugrezno glavo in notranjim šestkotnikom (imbus) z
manjšo obremenljivostjo (ISO 10642:2026)
Fasteners - Hexagon socket countersunk head screws with reduced loadability (ISO
10642:2026)
Mechanische Verbindungselemente - Senkschrauben mit Innensechskant mit reduzierter
Belastbarkeit (ISO 10642:2026)
Fixations - Vis à tête fraisée à six pans creux à capacité de charge réduite (ISO
10642:2026)
Ta slovenski standard je istoveten z: EN ISO 10642:2026
ICS:
21.060.10 Sorniki, vijaki, stebelni vijaki Bolts, screws, studs
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN ISO 10642
EUROPEAN STANDARD
NORME EUROPÉENNE
March 2026
EUROPÄISCHE NORM
ICS 21.060.10 Supersedes EN ISO 10642:2019
English Version
Fasteners - Hexagon socket countersunk head screws with
reduced loadability (ISO 10642:2026)
Fixations - Vis à tête fraisée à six pans creux à capacité Mechanische Verbindungselemente - Senkschrauben
de charge réduite (ISO 10642:2026) mit Innensechskant mit reduzierter Belastbarkeit (ISO
10642:2026)
This European Standard was approved by CEN on 7 March 2026.

CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this
European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references
concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN
member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by
translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management
Centre has the same status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye and
United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2026 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 10642:2026 E
worldwide for CEN national Members.

Contents Page
European foreword . 3

European foreword
This document (EN ISO 10642:2026) has been prepared by Technical Committee ISO/TC 2 "Fasteners"
in collaboration with Technical Committee CEN/TC 185 “Fasteners” the secretariat of which is held by
BSI.
This European Standard shall be given the status of a national standard, either by publication of an
identical text or by endorsement, at the latest by September 2026, and conflicting national standards
shall be withdrawn at the latest by September 2026.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN shall not be held responsible for identifying any or all such patent rights.
This document supersedes EN ISO 10642:2019.
Any feedback and questions on this document should be directed to the users’ national standards
body/national committee. A complete listing of these bodies can be found on the CEN website.
According to the CEN-CENELEC Internal Regulations, the national standards organizations of the
following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria,
Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland,
Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Republic of
North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye and the
United Kingdom.
Endorsement notice
The text of ISO 10642:2026 has been approved by CEN as EN ISO 10642:2026 without any modification.

International
Standard
ISO 10642
Fourth edition
Fasteners — Hexagon socket
2026-03
countersunk head screws with
reduced loadability
Fixations — Vis à tête fraisée à six pans creux à capacité de
charge réduite
Reference number
ISO 10642:2026(en) © ISO 2026
ISO 10642:2026(en)
© ISO 2026
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on
the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below
or ISO’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii
ISO 10642:2026(en)
Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 2
4 Dimensions and gauging of head . 2
4.1 Dimensions .2
4.1.1 Gauging of head .6
5 Requirements and reference International Standards . 6
6 Marking and labelling . 8
6.1 Marking on product . .8
6.2 Labelling on package .8
7 Designation . 9
Annex A (informative) Minimum ultimate tensile loads for bolts and screws with full loadability,
coarse pitch threads M2 and M2,5 . 10
Bibliography .11

iii
ISO 10642:2026(en)
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards
bodies (ISO member bodies). The work of preparing International Standards is normally carried out through
ISO technical committees. Each member body interested in a subject for which a technical committee
has been established has the right to be represented on that committee. International organizations,
governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely
with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.
The procedures used to develop this document and those intended for its further maintenance are described
in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the different types
of ISO document should be noted. This document was drafted in accordance with the editorial rules of the
ISO/IEC Directives, Part 2 (see www.iso.org/directives).
ISO draws attention to the possibility that the implementation of this document may involve the use of (a)
patent(s). ISO takes no position concerning the evidence, validity or applicability of any claimed patent
rights in respect thereof. As of the date of publication of this document, ISO had not received notice of (a)
patent(s) which may be required to implement this document. However, implementers are cautioned that
this may not represent the latest information, which may be obtained from the patent database available at
www.iso.org/patents. ISO shall not be held responsible for identifying any or all such patent rights.
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and expressions
related to conformity assessment, as well as information about ISO's adherence to the World Trade
Organization (WTO) principles in the Technical Barriers to Trade (TBT), see www.iso.org/iso/foreword.html.
This document was prepared by Technical Committee ISO/TC 2, Fasteners, Subcommittee SC 11, Fasteners
with metric external thread, in collaboration with the European Committee for Standardization (CEN)
Technical Committee CEN/TC 185, Fasteners, in accordance with the Agreement on technical cooperation
between ISO and CEN (Vienna Agreement).
This fourth edition cancels and replaces the third edition (ISO 10642:2019), which has been technically
revised.
The main changes are as follows:
— Note 2 in Clause 1, Scope, editorially improved;
— Figure 4 corrected with d substituted by D ;
a
— Footnote e in Tables 1 and 2 corrected in the second sentence: Values for k are in relation to D .;
min a
— Footnote f in Figure 1 corrected to a ≤ 3P;
— Footnote h in Table 1 and Table 2 corrected to 3P;
— Table 4 editorially revised according to the latest template for product standards;
— Table 5 revised according to the latest agreed rounding rules for fasteners with reduced loadability and
wrong value for M3 with property class 12.9 corrected;
— Labelling on package (6.2) editorially improved;
— Clause 7, Designation, editorially revised according to the latest template for product standards;
— value for M2, property class 70 in Table A.1 in Annex A corrected to the new rounding rules and Footnote
a adjusted accordingly.
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www.iso.org/members.html.

iv
International Standard ISO 10642:2026(en)
Fasteners — Hexagon socket countersunk head screws with
reduced loadability
1 Scope
This document specifies the characteristics of hexagon socket countersunk head screws with reduced
loadability due to head design, in steel and stainless steel, with metric coarse pitch threads M2 to M20, and
with product grade A.
NOTE 1 Other dimensional options are given in ISO 888, ISO 965-1 and ISO 4753.
NOTE 2 The reduced loadability (related to the countersunk head dimensions in combination with penetration
of the hexagon socket specified in this document) implies a limitation of ultimate tensile load shown by a specific
marking (property class preceded by a zero). The loadability in the head is assumed to be 80 % of that in the thread for
all sizes and all property classes; see Table 5.
NOTE 3 Particular attention is needed to ensure alignment of the countersunk head with the bearing surface of the
countersink in the assembly.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content constitutes
requirements of this document. For dated references, only the edition cited applies. For undated references,
the latest edition of the referenced document (including any amendments) applies.
ISO 225, Fasteners — Bolts, screws, studs and nuts — Symbols and descriptions of dimensions
ISO 898-1, Mechanical properties of fasteners made of carbon steel and alloy steel — Part 1: Bolts, screws and
studs with specified property classes — Coarse thread and fine pitch thread
ISO 965-1, ISO general purpose metric screw threads — Tolerances — Part 1: Principles and basic data
ISO 1891-4, Fasteners — Vocabulary — Part 4: Control, inspection, delivery, acceptance and quality
ISO 3269, Fasteners — Acceptance inspection
ISO 3506-1, Fasteners — Mechanical properties of corrosion-resistant stainless steel fasteners — Part 1: Bolts,
screws and studs with specified grades and property classes
ISO 4042, Fasteners — Electroplated coating systems
ISO 4753, Fasteners
...